Improvement in scroll-saws



C. A. DEARBORN. Scroll-Saws.

No. 220,705. Patented Oct. 21,1879.

NPETERB. PHDTO-LITHOGRPHER. WASHINGTON. D C.

UNITED STATES PATENT OEETGE.

CHARLES A. DEARBORN, OF CHICAGO, ILLINOIS, ASSIGNOR TO CHARLES E. TUERK,OF SAME PLACE.

IM PROVEM ENT IN SCROLL-SAWS.

Specilieation forming part of Letters Patent N o. 220,705, dated October21,1879; application filed February 12, 1879.

To all whom it may concern;

Beit known that I, CHARLES A. Dnannomv, of the city of Chicago, in thecounty of Cook and State of Illinois, have invented a new and usefulImprovementin Sorrento or Scroll Saws; and I hereby declare thefollowing to be a full, clear, and exact description thereof, referencebeing had to the accompanying drawings, of which- Figure 1 is aperspective view of my device attached to a sewing-machine; Fig. 2, aside elevation of the same; Fig. 3, a perspective view of the clamp forsecuring the saw-blade to the arms, and Fig. et a detail view.

My invention relates to Sorrento or scroll saws, such as are employedfor the purpose of sawing out ornamental and fantastic designs; and myobject is to construct such a saw in the simplest and cheapest formpossible, and yet have it capable of executing the finest and mostcomplicated work with the utmost speed and exactness.

To the above end my invention consists, first, in employing a smalljig-saw operated by a crank-wheel and pitman, and pivoted to a frame orbracket which is provided with branching arms, one of which carries thepulley and the crank-wheel above referred to, in the shaft of which adrill is inserted, and another a disk through which the saw passes,

the said bracket being-.further provided with a clamping contrivanceespecially adapted for attaching it to the table of an ordinarysewing-machine, whereby the saw is operated by the driving-wheel andtreadle of the said machine; and it consists, secondly, in.the peculiarclamping device which I employ for adjusting the saw to thereciprocating arms, and in certain other details of the construction,all as hereinafter more fully set forth.

Referring to the drawings, Ais thc bracket, comprising four branchingarms, k, Z, m, and a. The arm k rests upon the table B of thesewing-machine, and the arm l curves backward underneath the same, aclamp-screw, p, to secure the whole device firmly to the said table,passing upward through its rear extremity and bearing against the underside of the table, asvshown.

Pivoted to the upper end of the arm k, as represented, is the U-shapedframe of the jigsaw, comprising the arms C C.

The arm m of the bracket projects downward and forward, and terminatesin a hollow journal, q, within which revolves the shaft r, carrying atone end the pulley-wheel D, connected by a belt, E, to the driving-wheelF of the sewing-machine, and at the other end the crank-wheelG,connected by a pitman, H, to the lower arm C of the saw-frame.

The arln a of the bracket projects upward and forward, and carries thewooden disk I, which serves as the rest for the material sawed.

The saw J is connected to the extremity of each arm C of the frame andpasses through an opening in the center of the disk I.

It is of course essential that the saw J be made easily detachable fromthe arms C C, and at the same time capable of very firm adjustment. Ieffect this by means of the clamping device most clearly represented inFig. 3, which consists of a plate, s, secured to each arm C of thesaw-frame by means of a screw, t. The plate s is provided with an arm,s,which rests within guides u, formed by casting short longitudinal ribsupon the arm C, thus preventing the plate from slipping around as thescrew is turned. The saw is clamped in place between the plate s and thearm C, as shown.

To secure a proper tension to the saw-blade, the ends of the arms C C,which I make of malleable iron to give the requisite elasticity, must bepressed together somewhat before the second clamping-plate is tightened.

A drill, c, sits within a socket in the extremity of the shaft r, andits purpose is to puncture the scroll or sheet of wood, or guttapercha,or whatever the material may be, at any desired point or points for theinsertion ofthe saw.

My device may be attached to any sewingmachine without any possibilityof injury thereto, only the treadle and driving-wheel being brought intorequisition, allowing the rest of the mechanism to be disconnected.While, however, my saw is designed with an especial view to beingattached to a sewingmachine, it is obvious that it may easily beconnected to any other drivin g-power.

What I claim as new, and desire to secure by Letters Patent, is-

1. The scroll-sawing dcvice consisting of the U-shaped frame carryingthe saw J, the bracket A, comprising the arm k, to which the said frameis pivoted, arm l, with the clampscrew p, arm m, terminating in ajournal, q, and carrying the shaft r, upon which are the belt-wheel D,for connection with suitable driving-power, and crank-wheel G, connectedto the lower arm C of the frame by a pitlnan, H, and the arm n, carryingthc disk I, substantially as described.

2. In combination with the table, drivingwheel, and treadle of asewing-machine, the

ing-plate s, secured to the arm C by means of a screw, t, and prolongedinto an arm, s', {itting between guides u upon the arm C, substantiallyas described.

CHARLES A. DEARBORN.

In presence of- ERNEsT CUMMING, J AMES L. GILLINGHAM.

